Electric connecter



May 3, 19,27. 1,627,306

J. BERG ELECTRIC CONNECTER Filed Aug. 51, 1921 25 of Fig. 1.

Patented May 3, 1927.

UNITED y STATES JOHN BERG, OF CHICAGO, ILLINOIS, ASSIGNOR TO METAL INGCOMPANY, OF CHICAGO,

SPECIALTIES MANUFACTUR:

ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRIC CONNECTER.

Application led August 31, -1921. Serial No. 497,099.

This invention relates particularly `to electric connecters, such as areused for connecting electric conductors to any electrical device, suchas an electric lamp.

The primari1 object is to provide a connecter with an improved switchdevice whereby the circuit,v may be established or broken with facility,as desired.

The invention may be employed very advantageously in connection witheither a dash-lamp or an'exploring lamp for automobiles.

The invention is illustrated in its preferred embodiment in theaccompanying drawing, in which- Fig, 1 represents a plan View of adashlamp constructed in accordance with the invention, the actuatingstem of the switch being shown in section and the handle thereof beingshown in dotted lines; Fig. 2, a section ofthe device taken parallelwith the plane of the paper, the inner parts being shown in elevation;and Fig. 3, an enlarged sectional view taken as indicated at line 3 Thedevice, in the embodiment shown,

comprisesl a metal sleeve or shell Aequipped at onev end with anattaching Bange A and at the opposite` end with a hood or annularsupporting member A2 a reflector or shield .Al removabl mounted on themember Ati; a rotatable an longitudinally movable plug B mounted in thesleeve A and itself comprising a metal sleeve 1l and an insulating plugl* snugl fitted in the sleeve 1; a springv contact centrally mounted intheplug vB and having connected with its base end an electric conductorB2; and an incandescent lamp or bulb C having a shank 2 e uipped withlateral studs 3' which engage ayonet slots 4 with which the sleeve A isprovided at its outer or front end, the shank of the lam being rovidedwith a central contact 5 w ich is a apted to make contact with thecentral contact B of the plug.

The shell A is, rovided with a cam-slot 6 which is provide at its upperend with an oiset 'or bay 6. An operating handle 7 is provided which hasa reduced shank 7 extending through the cam-slot 6 and whose inner endis threaded and secured in a threaded lateral socket with which theplug` B is provided.

A coil spring 8 is interposed between the iner end of the shank of thelamp and the adjacent end of the plug. This coil spring has one endbearing. against the end of the lamp-shank and has the other endrojecting into an annular recess 9; which is ormed by reducing the endortion of the insulation 6o plug 1*. An annu ar roove 9 is provided ator near the base of t e reduced portion of the insulation plug, and theextremity of the sprmg is turned inwardly and entered in said annulargroove, as indicated at 9b, so 65 that the spring is anchored to theinsulation plu This is a matter of convenience in assem ling andv alsoserves to prevent loss of the spring when the lamp-bulb is removed orthe parts are disassembled.

The spring contact B comprises a small metal tube 10 in which is mounteda spring plunger l()a and a spring 10b which is conlined between theplunger and a small metal plug 10 at the opposite end of the tube 10. 75The conductor B2 -is 'secured to the contact B" by means of a screw 11.f

In the illustration given', the lamp C has its shank provided with ametal shell which l makes' contact with the metal sleeve A; and 80 whenthe metal sleeve A is applied to the metal dash of anautomobile oneterminal of the lam isthus grounded, while the central termina of thelamp makes contact with the springvcont'act B of the connecter, as- 35suming theplug B to be in the elevated or forward positionillustrated; ll

The contact is established by rotating the plug thru the medium of thehandle 7 and moving the stem thru the inclined cam-slot 6. In thisoperation, the spring 8V is placed under greater compression, and at theend of the movement the shank 2"l snaps into the offset or recess 6 ofthe slot, so that the lug will be locked in the forward position.

n this position, the plunger 102L of the spring contact B" is forcedrearwardly against the resistance of the spring 10", thus v insuringgood contact. When the handle 7 is moved to withdraw the shank 7 of the100 operating handle from the recess 6, the spring 8 will then operateto yforce the plug B back or rearwardly, thus withdrawing theplunger-form contact 10" from the central contact of the lamp.

The im roved device is simple in construction, capa leof being cheaplymanufactured, and is'easily operated.

TheA foregoing detailed `description has been given for clearness ofunderstanding 11 only, and no unnecessary limitations should beunderstood therefrom, but the appended claim should be construed asbroadly as permissible in View of the prior art.

What I regard as new, and desire to secure by Letters Patent, is'

A deviceof the character set forth, cornprising a shell equipped at oneend with an.

attaching flange adapted to be secured to a 10 dash and equipped at theother end with bayonet slots, said shell being provided lintermediatelywith a cani-slot having an olfplug and adapted to make contact with the'terminal of a lamp or plug entered. in the free end of said shell, anda spring secured to the end portion of said first-named plug 20 andadapted to retract the plug and brea the circuit.

JOHN BERG.l

